void setup(){
  pinMode(31, OUTPUT);
  pinMode(32, OUTPUT);
  pinMode(33, OUTPUT);
  pinMode(34, OUTPUT);
  pinMode(35, OUTPUT);
  pinMode(36, OUTPUT);
  pinMode(37, OUTPUT);
  pinMode(38, OUTPUT);
}
void loop(){
  digitalWrite(31,LOW);
  delay(1000);
  digitalWrite(32,LOW);
  delay(1000);
  digitalWrite(33,LOW);
  delay(1000);
  digitalWrite(34,LOW);
  delay(1000);
  digitalWrite(35,LOW);
  delay(1000);
  digitalWrite(36,LOW);
  delay(1000);
  digitalWrite(37,LOW);
  delay(1000);
  digitalWrite(38,LOW);
  delay(1000);
  digitalWrite(31,HIGH);
  digitalWrite(32,HIGH);
  digitalWrite(33,HIGH);
  digitalWrite(34,HIGH);
  digitalWrite(35,HIGH);
  digitalWrite(36,HIGH);
  digitalWrite(37,HIGH);
  digitalWrite(38,HIGH);
}
